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Publication numberUS3734697 A
Publication typeGrant
Publication dateMay 22, 1973
Filing dateJul 13, 1970
Priority dateJul 13, 1970
Also published asCA945349A, CA945349A1, DE2134988A1
Publication numberUS 3734697 A, US 3734697A, US-A-3734697, US3734697 A, US3734697A
InventorsL Sieghartner
Original AssigneeRoth Co Roy E
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Pump impeller making
US 3734697 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

y 22, 1973 1.. J. SIEGHARTNER 3,734,697

PUMP IMPELLER MAKING Filed July 13, 1970 2 j w m M w fl 2 a. 1 m 3 m a. w NW g fwd w w United States Patent O US. Cl. 29156.8 R 3 Claims ABSTRACT OF THE DISCLOSURE The process of making an impeller for use in a pump by affixing a disc having blades formed about its outer periphery onto the reduced diameter portion of a hub. A plurality of longitudinal grooves is formed lengthwise into the reduced diameter hub portion and then pressed into a circular bore formed in the center of the impeller disc. The assembly is then placed in a press to swage the outer annular edge of the reduced diameter hub portion into a chamfer provided around the circular bore of the disc to thereby solidly hold the disc against the shoulder on the hub.

BACKGROUND OF THE INVENTION This invention relates to a pump impeller design and in particular, relates to a method of making a pump impeller.

In order to meet the varied capacity and head requirements for regenerative turbine pumps, it is necessary to have a multitude of impeller diameters and thicknesses to accommodate a series of pumps. Also, in the design of different pumps mechanical considerations dictate that the hubs be of different sizes even though the impeller disc portions have identical dimensions. Using current techniques of making pump impellers, it requires the machining and stocking of a large inventory of impellers of various sizes. This invention avoids the necessity of maintaining such a large inventory by providing a method of mounting different size discs having peripheral impeller blades onto different size hubs in a quick operation.

SUMMARY OF THE INVENTION This invention provides a method for affixing a disc having impeller blades formed about its periphery onto a hub in a fast and economical manner. Prior to mounting the impeller disc on the hub, a straight coarse knurl is cut into the reduced diameter portion of the hub, and a chamfer is cut around both ends of the circular center bore of the impeller disc. To mount the impeller disc on the hub, the knurled section of the hubs reduced diameter portion is pressed into the center bore of the impeller disc and the outer annular edge of the reduced hub portion is swaged into the adjacent chamfer to hold the disc solidly against the shoulder on the hub.

DESCRIPTION OF DRAWING FIG. 1 illustrates a disc having turbine blades formed about its periphery and an impeller hub in an unassembled relation;

FIG. 2 illustrates the step of pressing the knurled section of the hub into the center opening of the disc;

FIG. 3 is a sectional view taken along the line 33 of FIG. 2 and looking in the direction of the arrows;

FIG. 4 illustrates the step of swaging the end of the hub to lock the disc in place; and

FIG. 5 is an end view taken from the left end of FIG. 4.

DESCRIPTION OF PREFERRED EMBODIMENT Referring to FIG. 1, there is illustrated a disc having a plurality of turbine pockets 12 formed about its peripheral edge, and a hub 14 having a reduced diameter 3,734,697 Patented May 22, 1973 portion 16. The disc 10 has a center opening 18 provided with a chamfer 20 formed in both surfaces of disc 10.

The hub 14 is made as an automatic screw machine product. A plurality of longitudinal grooves 22 are cut into the reduced diameter portion 16 adjacent the shoulder 24 to provide a straight coarse knurl section 26. The outer annular end 28 of reduced diameter portion 16 is machined to the depth of grooves 22.

To mount the disc 10 onto the hub 14, the knurled section 26 is pressed into the center opening 18 to cut corresponding grooves 30 in the disc internal diameter, as depicted in FIG. 5, until the inward side of disc 10 abuts against shoulder 24. The result of this pressing step is to provide a good driving bond between the impeller disc 10 and the hub 12, which is as effective as a key or spline without causing an excessive interference fit that would distort the disc 10.

The assembly depicted in FIG. 2 is then placed in a press to swage (FIG. 4) the outer annular edge 28 of hub reduced portion 16 into the chamfer 20 for the purpose of holding the disc 10 rigidly against the shoulder 24 on the hub 14. The die for this swaging operation is a specially designed concentric ring to control the concentricity of the swaged portions 34 with the hub 14. The die I.D. is controlled so that all the metal displaced goes against the impeller disc 10 and not into the bore of the hub, as would be the case if the end 28 of hub 14 were swaged with a fiat die over its entire end area.

After swaging the resulting composite impeller 36 is put through normal finishing operations to bring it to exact size, FIG. 5 depicts the finished composite impeller mounted on a shaft 40 and fixed thereto by a spline or key 42.

From the foregoing description, it will become apparent that making an impeller by mounting an impeller disc on a hub in accordance with the principles of this invention provides the following advantages:

(1) More flexible inventory.

(2) More simple machine operations.

(3) Ability to make parts in volume using an automatic screw machine which formerly were made in lower quantities by a more expensive chucking machine operation.

While there has been shown and described a preferred embodiment of the present invention, it will be understood by those skilled in the art that various rearrangements and modifications may be made therein Without departing from the spirit and scope of the invention. Although in the description of invention a turbine impeller was used, obviously the method of this invention could be practiced to form any type of impeller, for example, a centrifugal impeller.

What is claimed is:

1. Method of making a pump impeller by afiixing a disc with peripheral blades onto the reduced diameter end portion of a hub, where the diameter of said reduced diameter end portion is slightly greater than a circular bore formed in the center of said impeller disc, comprising the steps of:

(a) forming a chamfer into said disc about one end of said circular bore,

(b) forming a plurality of longitudinal grooves about said reduced hub portion in a lengthwise direction to define a plurality of lengthwise parallel ridges,

(c) pressing said reduced hub portion into the end of said circular bore of said impeller disc opposite to said chamfer to cause said parallel ridges to cut grooves into said impeller disc, and

(d) swaging the outer annular edge of said reduced hub portion into said chamfer to press said impeller disc against the shoulder on said hub defined by the 1 3 4 innerend of said reduced hub portion by using a 1,112,525 10/1914 Darling 29-432 UX concentric ring die to prevent the displacement of 1,988,595 1/ 1935 Hiss 29-156.8 R any metal into the bore of said hub. 2,162,902 6/1939 Adams 29-156.8 R 2. The method of claim 1 wherein said swaging step is 2,750,660 6/1956 Newcomb 29-432 performed around the entire periphery of said outer an- 5 nular edge of said reduced hub portion. I OTHER REFERENCES 3. Themethod of claim 1 wherein said charnfer iforming 15 Ways to Fasten Gears to Sh ft Product Engi step comprises forming a chamfer into said impeller disc nearing, 4 May 30 19 0 about both ends of said circular bore.

10 RICHARD J. HERBST, Primary Examiner D. C. REILLY III, Assistant Examiner References Cited UNITED STATES PATENTS 2,119,334 5/1938 Leffler 29 432 UX US. Cl. X.R. 1,415,542 5/1922 Fuegel et a1 29 522 UX 2 1,157,666 10/1915 Bennett 29 432 X 15 9 156's 156's 525

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3872578 *May 6, 1974Mar 25, 1975Cyclone Seeder Company IncMethod of connecting a rotating member to a shaft
US3961864 *Nov 23, 1973Jun 8, 1976Papst-Motoren KgRadial flow fan
US4092773 *Jan 3, 1977Jun 6, 1978Donahue Carroll FMethod for forming a clevis
US4110051 *May 20, 1977Aug 29, 1978Press- Und Stanzwerk AgApparatus for producing a non-releasable connection and non-releasable connection produced with such apparatus
US4245960 *Sep 5, 1978Jan 20, 1981Air Drive, Inc.Connecting structure for a hub and fan blade
US4489468 *Jun 24, 1982Dec 25, 1984Elliott Turbomachinery Co., Inc.Method of providing a multivalve turbine nozzle ring interface seal
US4795924 *Sep 23, 1987Jan 3, 1989Mitsuba Electric Manufacturing Co. Ltd.Magneto bowl-shaped rotor
US4850802 *Apr 21, 1983Jul 25, 1989Allied-Signal Inc.Composite compressor wheel for turbochargers
US4891876 *Feb 16, 1989Jan 9, 1990Concentric Pumps LimitedMethod of making pump impeller by lost-foam molding
US4903810 *Sep 22, 1983Feb 27, 1990Dyneer CorporationClutch shoe construction and method of making same
US5407318 *Dec 6, 1993Apr 18, 1995Nippondenso Co., Ltd.Regenerative pump and method of manufacturing impeller
US5855444 *May 30, 1994Jan 5, 1999Ab VolvoDevice for centering a rotational unit
US6076247 *Aug 17, 1998Jun 20, 2000Dana CorporationMethod of connecting a ball and socket joint to a control arm in a vehicle suspension system
US7140992 *Jun 13, 2001Nov 28, 2006Litens Automotive PartnershipHigh torque retention joint in a tensioner
US8402650May 23, 2006Mar 26, 2013Thyssenkrupp Presta Teccenter AgBuilt-up camshaft
US8844403Mar 20, 2010Sep 30, 2014Audi AgShaft-hub connection
US20040009836 *Jun 13, 2001Jan 15, 2004Dix Harvey J.High torque retention joint in a tensioner
US20050039318 *Aug 17, 2004Feb 24, 2005Thomas FeisMethod for connecting an aluminum die-cast part to another part
US20050097721 *Nov 6, 2003May 12, 2005Bratek Daniel J.High pressure sensor with knurl press-fit assembly
US20100224145 *May 23, 2006Sep 9, 2010Thyssenkrupp Automotive AgBuilt-Up Camshaft
USRE44204 *Jun 13, 2001May 7, 2013Litens Automotive PartnershipHigh torque retention joint in a tensioner
EP0013448A2 *Dec 13, 1979Jul 23, 1980Task Power and Control LimitedImprovements in or relating to cylindrical bodies having fixed collars
EP0013448A3 *Dec 13, 1979Aug 20, 1980Task Power and Control LimitedImprovements in or relating to cylindrical bodies having fixed collars
EP0821093A2 *Jul 17, 1997Jan 28, 1998Philco Italia S.P.A.Process for assembling a shaft and a flange for the support of a rotating basket of a washing machine, and assembly thus obtained
EP0821093A3 *Jul 17, 1997Sep 9, 1998Philco Italia S.P.A.Process for assembling a shaft and a flange for the support of a rotating basket of a washing machine, and assembly thus obtained
EP1072339A2 *May 26, 2000Jan 31, 2001Aida Engineering Co., Ltd.A method of moulding a blank into a moulded component
EP1072339A3 *May 26, 2000May 15, 2002Aida Engineering Co., Ltd.A method of moulding a blank into a moulded component
EP1498218A3 *Jul 14, 2004Jul 13, 2005DGS Druckguss Systeme AGMethod of manufacturing a functional part of lightweight construction
EP1741945A1 *Jun 20, 2005Jan 10, 2007Thyssenkrupp Automotive AGAssembled camshaft
WO2003071137A1 *Feb 24, 2003Aug 28, 2003Rietschle Thomas Gmbh + Co. KgLateral channel compressor and device for machining a flange on a drive motor for a lateral channel compressor
WO2006119401A2 *May 3, 2006Nov 9, 2006Whitesell International CorporationSplined fastener
WO2006119401A3 *May 3, 2006Apr 12, 2007Whitesell Int CorpSplined fastener
WO2006136252A1 *May 23, 2006Dec 28, 2006Thyssenkrupp Automotive AgAssembled camshaft
WO2013164147A1 *Apr 3, 2013Nov 7, 2013Robert Bosch GmbhMethod for connecting a shaft to a rotary component and turbocharger shaft produced by said method
Classifications
U.S. Classification29/889.23, 29/432.1, 29/525, 29/509, 29/432, 403/359.5
International ClassificationF16D1/072, B23P11/00, B21K25/00, F04D5/00, F04D23/00, F04D29/20, F04D29/18
Cooperative ClassificationF04D29/20, F04D23/008, F04D5/002, F16D1/072, B21K25/00, F04D29/188, B23P11/00, F16H55/17
European ClassificationB21K25/00, F04D29/20, B23P11/00, F04D29/18R, F16D1/072, F04D5/00R, F04D23/00R